Standardized test methods for investigating attrition and elutriation characteristics of natural sorbents in fluidized-bed coal combustors
Experimental techniques and standard laboratory test methods have been developed to measure the attrition and elutriation characteristics of limestones in an atmospheric-pressure fluidized-bed coal combustor (AFBC) at 850/sup 0/C. The laboratory test device used to measure the attrition characteristics of a sorbent is a small laboratory size fluidized bed. The elutriation rate and the attrition constant were determined for a group of limestones when the system is assumed to be at steady state; i.e., after sorbent breakup due to thermal shock and decrepitation during calcination of the sorbent feed has occurred. An attrition model has been developed to analyze the laboratory data and to predict sorbent performance in AFBCs. The attrition model, based on a stoichastic model proposed by Fan and Srivastava, assumes that the particle disintegration is such that the abrasive removal of material occurs only from the surface of the particle. The attrition constants of the limestones tested ranged from 1.5 x 10/sup -6/ sec/sup -1/ to 9.2 x 10/sup -8/ sec/sup -1/, and the elutriation rate had a fractional mass loss which ranged from 8.1 x 10/sup -8/ min/sup -1/ to 1.0 x 10/sup -3/ min/sup -1/. The standard tests utilized by the model are undergoing refinement to improve the accuracy of the predictions.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6529507
- Report Number(s):
- CONF-810581-3; ON: DE83008602
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
421000* -- Engineering-- Combustion Systems
ADSORBENTS
CARBONATE ROCKS
COMBUSTORS
DATA
ELUTRIATION
EXPERIMENTAL DATA
FLUIDIZED-BED COMBUSTORS
FRAGMENTATION
INFORMATION
LIMESTONE
MATHEMATICAL MODELS
MEASURING METHODS
NUMERICAL DATA
OPERATION
ROCKS
SEDIMENTARY ROCKS
SEPARATION PROCESSES